In a bowl, beat softened butter, peanut butter, powdered sugar and coconut flour until ingredients are combined.
Line a 9X14 baking pan with parchment paper and spread the peanut butter layer evenly.
Place in freezer for 10 minutes.
Break dark chocolate bars in a small greased glass bowl and add butter.
Microwave for 30 seconds, then stir.
Microwave in 15 second intervals, stirring until melted.
Remove baking pan from freezer and spread the chocolate layer on top of peanut butter layer.
Return to freezer for several hours to overnight to allow bars to set.
Once set cut into bars or bark.
Store in refrigerator or freezer.